OPTICAL-PROPERTIES OF COMPOSITE-MATERIALS AT HIGH-TEMPERATURES

The optical properties of composite materials are studied theoreticall y as a function of temperature via a phenomenological model for temper atures up to the melting points of the materials. Both the Maxwell-Gar nett and Bruggeman models are considered and the temperature variation of the optical constants of the metallic particles is obtained with a n account of the dependence of both the electron-phonon and electron-e lectron scattering on temperature. The results show that the extinctio n coefficient of the composite generally increases with temperature an d that the Maxwell-Garnett and Bruggeman models can give very differen t results at certain optical frequency. Transmittance through a thin c omposite film is calculated providing a means for a simple experimenta l study of the various modeling results. Copyright (C) 1996 Elsevier S cience Ltd.